What is meant by elevation in boiling point? Why is it a colligative property?
The increase in boiling point of the solvent in a solution when a non-volatile solute is added.
Because it depends upon molality/the number of solute particles rather than their nature
Detailed Answer:
Elevation in boiling point can be defined as an increase in boiling point of the solvent in a solution on addition of a non-volatile solute.
It is considered as a colligative property because it depends upon the number of solute particles dissolved in a definite amount of the solvent and not on the nature of the solute.
Because it depends upon molality/the number of solute particles rather than their nature
Detailed Answer:
Elevation in boiling point can be defined as an increase in boiling point of the solvent in a solution on addition of a non-volatile solute.
It is considered as a colligative property because it depends upon the number of solute particles dissolved in a definite amount of the solvent and not on the nature of the solute.
What is meant by ‘disproportionation’ ? Give an example of a disproportionation reaction in aqueous solution.
Explain why :
(i) E° for Mn³⁺/Mn²⁺ couple is more positive than that for Fe³⁺/Fe²⁺. (At. Nos. Mn = 25, Fe = 26).
(ii) Ce³⁺ can be easily oxidized to Ce⁴⁺. (At. No.Ce = 58).
What is meant by positive deviations from Raoult’s law ? Give an example. What is the sign of H for positive deviation ?
The following curve is obtained when molar conductivity is plotted against the square root of concentration, c½ for two electrolytes A and B :
When chromite ore FeCr₂O₄ is fused with NaOH in presence of air, a yellow coloured compound
(A) is obtained which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms a orange coloured crystalline compound (C).
(i) Write the formulae of the compounds (A), (B) and (C).
(ii) Write one use of compound (C).
Explain the following observations:
(i) Copper atom has completely filled d orbitals (3d¹⁰) in its ground state, yet it is regarded as a transition element.
(ii) Cr²⁺ is a stronger reducing agent than Fe²⁺ in aqueous solution.